Home |
Search |
Today's Posts |
![]() |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
![]()
Posted to sci.electronics.repair
|
|||
|
|||
![]()
Hi! my philips 28" tv which was giving erratic picture and making a
buzzing sparking sound. from usenet posts & faq, found the noise was coming from the crt socket. i carefully opened the crt socket & cleaned contact which clamp on the input wire.this socket had a spark gap built in with 2 metal hemispheres. on 1 side of the spark gap i noticed a tiny glob of metal which fell off on cleaning. TV is now working. No more sparking noise! but the picture is slightly less focused - it is hard to read tiny text (like satellite channel info) on the screen. & there is a very faint narrow almost horizontal line every inch over the entire screen. what cause the socket failure? what is causing this line? did i need to re set the focus after cleaning the socket? Many thanks X |
#2
![]()
Posted to sci.electronics.repair
|
|||
|
|||
![]()
xamman wrote:
Hi! my philips 28" tv which was giving erratic picture and making a buzzing sparking sound. from usenet posts & faq, found the noise was coming from the crt socket. i carefully opened the crt socket & cleaned contact which clamp on the input wire.this socket had a spark gap built in with 2 metal hemispheres. on 1 side of the spark gap i noticed a tiny glob of metal which fell off on cleaning. TV is now working. No more sparking noise! but the picture is slightly less focused - it is hard to read tiny text (like satellite channel info) on the screen. & there is a very faint narrow almost horizontal line every inch over the entire screen. what cause the socket failure? probably just dirt on the thing caused it to arc. what is causing this line? retrace. Just turn the brightness knob down very slightly and it'll go away in many cases. did i need to re set the focus after cleaning the socket? sounds like it. Use an insulated tool! NT |
#3
![]()
Posted to sci.electronics.repair
|
|||
|
|||
![]()
thanks for the tips. I set the focus & brightness from crt neck & now
picture is as good as new! however i would like to determine if that tiny glob of metal on the spark gap is due to a failing or weak part somewhere else on the TV what components could contribute to this? thanks X |
#4
![]()
Posted to sci.electronics.repair
|
|||
|
|||
![]()
xamman wrote:
thanks for the tips. I set the focus & brightness from crt neck & now picture is as good as new! however i would like to determine if that tiny glob of metal on the spark gap is due to a failing or weak part somewhere else on the TV what components could contribute to this? thanks X Glob of metal? Could it be a leftover blob of solder that worked its way in there? |
#5
![]()
Posted to sci.electronics.repair
|
|||
|
|||
![]() Glob of metal? Could it be a leftover blob of solder that worked its way in there? thx for your reply but there are no soldered parts in the vicinity of the spark gap inside the socket. it looks like molecules from the metal hemispheres of the spark gap have contributed to form the glob. the glob was in the centre of one of the hemis, the one the focus wire attaches to. X |
#6
![]()
Posted to sci.electronics.repair
|
|||
|
|||
![]() xamman wrote: Glob of metal? Could it be a leftover blob of solder that worked its way in there? thx for your reply but there are no soldered parts in the vicinity of the spark gap inside the socket. it looks like molecules from the metal hemispheres of the spark gap have contributed to form the glob. the glob was in the centre of one of the hemis, the one the focus wire attaches to. X |
#7
![]()
Posted to sci.electronics.repair
|
|||
|
|||
![]()
xamman wrote:
thanks for the tips. I set the focus & brightness from crt neck & now picture is as good as new! however i would like to determine if that tiny glob of metal on the spark gap is due to a failing or weak part somewhere else on the TV no what components could contribute to this? none NT |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
![]() |
||||
Thread | Forum | |||
rcd socket placement/spur | UK diy | |||
Midway Phone Socket | UK diy | |||
Old Carrier furnace: spark igniter | Home Repair | |||
Weird phone wiring with new flat - help needed with BT Broadband and master socket | UK diy | |||
Question regarding adding an extra socket to the ring main | UK diy |